Categories | Stainless Steel Seamless Pipe |
---|---|
Brand Name: | HEBEIPENGXIN |
Model Number: | ASTM A106 Gr.B Galvanized Pipe, OD 3 Inch, SCH 40, 6 Meters, BE Ends. |
Certification: | ASME |
Place of Origin: | CHINA |
MOQ: | 20 Pcs |
Price: | Depending on quantity |
Payment Terms: | T/T |
Supply Ability: | 100000 Tons per year |
Delivery Time: | 2-10weeks |
Packaging Details: | Plywood cases or pallets |
Standard: | ASTM |
Grade: | A106 |
Packing: | Plywood cases or pallets |
Size: | OD 3 Inch, SCH 40, 6 Meters |
ASTM A106 Gr.B Galvanized Pipe, OD 3 Inch, SCH 40, 6 Meters, BE Ends.
Stainless steel seamless steel pipe is a kind of long strip steel with hollow section and no joint around it. Is resistant to air, steam, water and other weak corrosion media and acid, alkali, salt and other chemical corrosion medium corrosion steel pipe. Also known as stainless acid-resistant steel pipe.
Characteristics
First, the thicker the wall thickness of the product, the more
economical and practical, the thinner the wall thickness, its
processing cost will increase greatly; secondly, the process of the
product determines its limited performance, generally seamless
steel pipe accuracy is low: uneven wall thickness, low brightness
inside and outside the tube, high sizing cost, and inside and
outside the surface also pockmarks, black spots are not easy to
remove; third, its detection and shaping must be offline treatment.
Therefore, it shows its superiority in high pressure, high strength
and mechanical structure.
Stainless steel seamless pipe is resistant to air, steam, water and
other weak corrosion medium and acid, alkali, salt and other
chemical corrosion medium corrosion steel pipe. Also known as
stainless acid-resistant steel pipe.
The corrosion resistance of stainless steel seamless tubes depends
on the alloying elements contained in the steel. Chromium is the
basic element to obtain corrosion resistance of stainless steel.
When the chromium content in steel reaches about 12%, chromium acts
with oxygen in corrosive medium and forms a thin oxide film
(self-passivation film) on the steel surface, which can prevent the
steel matrix from further corrosion. In addition to chromium,
nickel, molybdenum, titanium, niobium, copper and nitrogen are
commonly used in stainless steel seamless pipes to meet the
requirements of stainless steel structure and properties for
various uses.
Stainless steel seamless pipe is a hollow long circular steel,
widely used in petroleum, chemical, medical, food, light industry,
mechanical instruments and other industrial transport pipelines and
mechanical structure components. In addition, when bending and
torsion strength is the same, the weight is lighter, so it is also
widely used in the manufacture of mechanical parts and engineering
structures. Also often used for the production of a variety of
conventional weapons, barrel, shells and so on.
Category
The rolling method is divided into hot rolling, hot extrusion and
cold drawing stainless steel pipe.
According to the metallographic structure of stainless steel, it is
divided into semi-ferrite semi-m martensite stainless steel pipe,
martensite stainless steel pipe, austenitic iron stainless steel
pipe and so on.
Specification quality
A, GB14975-94< Stainless Steel Seamless Steel Pipe) The length
of hot rolled steel pipe is 1.5~10 m, hot extruded steel pipe equal
to and greater than 1 The wall thickness of cold-drawn (rolled)
steel pipe is 0.5~1.0 mm ,1.0~7, and 1.5~8 m. if the wall thickness
is greater than 1.0
B, diameter of hot rolled (hot extruded) steel pipe is 54~480 mm
and the wall thickness is 4.5~45. The diameter of cold-drawn
(rolled) steel pipe is 6~200 mm and the wall thickness is 0.5~21.
C, there shall be no cracks, folding, cracking, cracks, rolling,
delamination and scarring defects on the inner and outer surfaces
of the steel pipe, these defects shall be completely removed
(except for pipes for machining) and the wall thickness and outer
diameter shall not exceed the negative deviation after removal. Any
other minor surface defects not exceeding the allowable negative
deviation may not be removed.
D, straight path allows depth. hot-rolled, hot-extruded steel tubes
of not more than 5% of nominal wall thickness with diameters less
than and equal to 140 mm, maximum depth not greater than 0.5 mm;
cold-drawn (rolled) steel tubes not greater than 4% of nominal wall
thickness, maximum depth not greater than 0.3 mm.
E, both ends of the steel pipe should be cut into right angles and
burr removed. Manufacturing process of stainless steel seamless
pipe:
1. hot rolling (extruded seamless steel pipe): tube billet →
heating → perforation → three-roll oblique rolling, continuous
rolling or extrusion → pipe removal (or reduction), cooling,
straightening → water pressure test (or flaw detection) and storage
The raw material of rolling seamless pipe is round tube billet. The
round tube embryo is cut by cutting machine to process the billet
with a growth degree of about 1 meter and sent to the furnace by
conveyor belt for heating. The billet is heated into the furnace at
a temperature of about 1200 degrees Celsius. The fuel is hydrogen
or acetylene. Furnace temperature control is a key problem. After
the round tube billet is out of the oven, it must pass through the
pressure perforation machine to carry on the empty. The common
perforator is conical roller perforator, which has high production
efficiency, good product quality, large perforation diameter
expansion and can wear many kinds of steel. After perforation, the
round tube billet has been three-roll oblique rolling, continuous
rolling or extrusion. After extrusion, take off the pipe and set
the diameter. The diameter fixing machine rotates into the steel
embryo through the conical bit at high speed to form the steel
pipe. The inner diameter of the steel pipe is determined by the
outer diameter length of the drill bit. After the steel pipe is
fixed, it enters the cooling tower and is cooled by water spray.
After cooling, the steel pipe will be straightened. The steel pipe
is straightened and sent from conveyor belt to metal flaw detector
(or hydraulic test) for internal flaw detection. If there are
cracks, bubbles and other problems inside the steel pipe, it will
be detected. Steel pipe quality inspection but also through strict
manual selection. After quality inspection of steel pipe, spray the
number, specification, production batch number and so on with
paint. And crane into the warehouse.
2. cold drawn (rolled) seamless steel pipe: pipe billet → heating →
perforation → head → annealing, pickling → oiling (copper plating),
multi-pass cold drawing (cold rolling)→ billet tube heat treatment,
straightening → water pressure test (flaw detection) marking →
storage.
The rolling method of cold drawn seamless steel pipe is more
complicated than that of hot rolled seamless steel pipe. Their
production process is basically the same in the first three steps.
The difference starts from the fourth step, after the tube blank is
empty, to hit the head, annealing. After annealing, special acid
liquid should be used for pickling. After pickling, oil. Then
followed by a multi-pass cold drawing (cold rolling) billet tube,
special heat treatment. After heat treatment, the same treatment as
steel pipe cooling process.
Applications
the stainless steel pipe is safe and reliable, sanitary and
environmentally friendly, economical and applicable, the
thin-walled pipe and the successful development of a new reliable,
simple and convenient connection method make it have more and more
irreplaceable advantages of other pipes, and the application in
engineering will be more and more popular, and the prospect is
promising.
With the implementation of the policy of reform and opening up in
China, the national economy has gained rapid growth, and urban
housing, public buildings and tourism facilities have been built in
large quantities, which has put forward new requirements for the
supply of hot water and domestic water. Especially the water
quality problem, people pay more and more attention, the request
also unceasingly enhances. Due to its corrosiveness, galvanized
steel pipe will gradually withdraw from the historical stage under
the influence of relevant national policies. Plastic pipe,
composite pipe and copper pipe have become the common pipes in
pipeline system. Nevertheless, in many cases, stainless steel pipe
has more advantages, especially thin-walled stainless steel pipe
with a wall thickness of only 0.6~1.2 mm in high quality drinking
water system, hot water system and water supply system that puts
safety and hygiene first. It has the characteristics of safety and
reliability, sanitation and environmental protection, economic
application and so on. It has been proved by engineering practice
at home and abroad that it is one of the best comprehensive
performance, new type, energy saving and environmental protection
pipes of water supply system, and it is also a very competitive
water supply pipe, which will play an unparalleled role in
improving water quality and improving people's living standard.
In the building water supply pipe system, because the galvanized
steel pipe has finished a hundred years of glorious history,
various new plastic pipes and composite pipes have developed
rapidly, but there are still some shortcomings in various pipes. It
is far from fully adapted to the needs of water supply pipe system
and national requirements for drinking water and related water
quality. Therefore, experts predict: building water supply pipes
will eventually return to the era of metal pipes. According to
foreign application experience, thin-walled stainless steel pipe is
considered as one of the best comprehensive pipes in metal pipe.
(1) The time is ripe for the popularization and application of
thin-walled stainless steel tubes in China
Thin-walled stainless steel pipe, which began to be produced and
used in China in the late 1990s, is a new generation in the field
of pipe materials, and has been widely used in the pipeline of
building water supply and direct drinking water.
The thin-walled stainless steel pipe is durable and has been
recognized by engineering circles, and the relevant parties are
starting from reducing the wall thickness and reducing the price to
facilitate further promotion. Especially small diameter stainless
steel pipe, the price is not high, so the matching connection
method, pipe fittings reliability and price are the main factors
that determine its development. Domestic developers in Sichuan,
Guangdong, Zhejiang, Jiangsu and other places have independently
developed the connection technology and pipe fittings, is a very
promising pipe. According to document No .71 of China Technology
Market Management Promotion Center and Guoke City Word [2001], the
Ministry of Construction and relevant departments have also
attached great importance to this new type of pipe. According to
the circular on the promotion and application of "medium and high
pressure water supply pipes with high diameter wall ratio and high
precision stainless steel and supporting pipe fittings and special
technology ", thin-walled stainless steel pipe is of great
significance to improving the grade of modern buildings in China
and improving and ensuring the water quality.
At the same time, the Ministry of Construction attaches great
importance to the promotion and application of thin-walled
stainless steel pipes. The industry standard for thin-walled
stainless steel pipes was issued in 2001. Related pipeline
engineering technical regulations and installation atlas, the
Ministry of Construction has issued a document, is being compiled
by Tongji University. Sichuan, Guangdong, Zhejiang, Jiangsu and
other places have professional manufacturers to produce thin-walled
stainless steel pipe, the product has become mature, therefore, the
time to promote the application has come.
(2) Good prospects in the domestic market
1. Large demand for building water supply lines
The annual demand for pipes between 2001~2010 is estimated to be 50
million 600 thousand ~ according to the Ninth Five-Year Plan of
Construction and the Outline of the Vision 2010 km, of which the
demand for hot and cold water pipes in residential building areas
is 400 thousand km. Some people believe that the development of
stainless steel pipes, to improve the grade of modern urban
buildings, of great significance.
2 Direct drinking water pipeline is developing rapidly
With the development of national economy, pipeline direct drinking
water has developed rapidly in Beijing, Shenzhen, Shanghai,
Chongqing and other cities in China. In direct drinking water,
stainless steel pipe system is undoubtedly second to none. Domestic
hotels, public places have been configured or in the allocation of
direct drinking water pipes.
3. The future of alternative imports from home is broad
In order to popularize stainless steel pipe, our country has solved
the technical problem of "high diameter wall ratio and high
precision" thin wall stainless steel pipe from the aspect of
reducing wall thickness and reducing cost since 1990s, so that
stainless steel pipe can be popularized and applied quickly. A kind
of pipeline should be able to popularize and apply in an all-round
way, without localization. Some domestic manufacturers have the
ability to produce and further develop thin-walled stainless steel
pipes and fittings.
(3) The stainless steel pipe is connected in various ways
The common types of pipe fittings are compression type, compression
type, live connection type, propulsion type, push thread type,
socket welding type, live connection type flange connection,
welding type and the derivative series connection mode of welding
and traditional connection. These connections vary according to
their principles and their scope of application, but most of them
are easy to install, solid and reliable. The sealing ring or gasket
material used in the connection, most of which meet the
requirements of the national standards of silicone rubber, nitrile
rubber and EPDM, etc., to avoid the worries of users.
Deviation level | Allowable deviation of standardized outer diameter |
D1 | ±1.5%, minimum ±0.75 mm |
D2 | ±1.0%. minimum ±0.50 mm |
D3 | ±0.75%. minimum ±0.30 mm |
D4 | ±0.50%. minimum ±0.10 mm |
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